Reorganize net/disk_cache into backend specific directories.

net/disk_cache/tracing/tracing_cache_backend.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "net/disk_cache/tracing_cache_backend.h"
+#include "net/disk_cache/tracing/tracing_cache_backend.h"
 
 #include "net/base/net_errors.h"
 
 namespace disk_cache {
 
 // Proxies entry objects created by the real underlying backend. Backend users
 // will only see the proxy entries. It is necessary for recording the backend
 // operations since often non-trivial work is invoked directly on entries.
 class EntryProxy : public Entry, public base::RefCountedThreadSafe<EntryProxy> {
  public:
@@ skipping 292 matching lines @@
 
 void TracingCacheBackend::GetStats(StatsItems* stats) {
   return backend_->GetStats(stats);
 }
 
 void TracingCacheBackend::OnExternalCacheHit(const std::string& key) {
   return backend_->OnExternalCacheHit(key);
 }
 
 }  // namespace disk_cache